functionList/xml.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!-- ==========================================================================\
|
|   To learn how to make your own language parser, please check the following
|   link:
|       https://npp-user-manual.org/docs/function-list/
|
\=========================================================================== -->
<NotepadPlus>
	<functionList>
		<!-- ========================================================= [ XML ] -->
		<!-- XML - eXtensible Markup Language                                  -->

		<parser
			displayName="XML Node"
			id         ="xml_node"
			commentExpr="(?x)                                               # Utilize inline comments (see `RegEx - Pattern Modifiers`)
							(?:\x3C!--(?:[^\-]|-(?!-\x3E))*--\x3E)          # Multi Line Comment
						"
		>
			<function
				mainExpr="(?x)                                              # Utilize inline comments (see `RegEx - Pattern Modifiers`)
						\x3C                                                # begin of node
						(?:
							(?-i:\?XML)                                     # only name of root node is allowed to start with a question mark
						|	\w+(?::\w+)?                                    # a node name can contain a colon e.g. `xs:schema`
						)
						(?:                                                 # match attributes
							\s+                                             # at least one whitespace before attribute-name
							\w+(?::\w+)?                                    # an attribute name can contain a colon e.g. `xmlns:xs`
							\h*=\h*                                         # name-value separator can be surrounded by blanks
							(?:                                             # quoted attribute value, embedded escaped quotes allowed...
								\x22(?:[^\x22\x5C]|\x5C.)*?\x22             # ...double quoted...
							|	\x27(?:[^\x27\x5C]|\x5C.)*?\x27             # ...single quoted
							)
						)+                                                  # only match nodes with at least one attribute
					"
			>
				<functionName>
					<nameExpr expr="[^\x3C]*" />
				</functionName>
			</function>
		</parser>
	</functionList>
</NotepadPlus>